3.3 HUMAN DIGESTIVE SYSTEM NAME: MELVINDASS A/L SANDANADASS CLASS: 2 AMBER CHAPTER 3
WHAT IS THE MEANING OF FOOD DIGESTION?? Is a process of breaking down food that is complex into molecules that are small, simple, soluble so that they can be absorbed by the cells of the body
COMPARISON BETWEEN PYSICAL DIGESTION AND CHEMICAL DIGESTION PYSICAL DIESTION CHEMICAL DIGESTION SIMILARITY Break down of food happens in the digestive tract DIFFERENCES Mouth ORGAN INVOLVED Mouth, stomach, duodenum and intestine Complex molecules DIGESTIVE OUTCOME Simple molecules No INVOLVES ENZYMES Yes
THE STRUCTURE OF THE HUMAN DIGESTIVE SYSTEM Mouth Salivary glands Oesophagus Liver Gall bladder Pancreas Large intestine Stomach Duodenum Small intestine Rectum Anus Mouth Oesophagus Stomach Small intestine Duodenum Large intestine Rectum Anus
THE FLOW OF FOOD IN THE DIGESTIVE TRACT • Food is chewed by teeth MOUTH OESOPHAGUS STOMACH STARCH MALTOSE • Food are softened by saliva • Salivary amylase in saliva breaks down starch into maltose Salivary amylase • Food that enters oesophagus is called bolus • The process of peristalsis pushes the food into the stomach • Wall of stomach secrete protease and hydrochloric acid • Hydrochloric acid is to kill bacteria and activates the protease • Protease breaks down protein into polypeptides • Food that is semi-liquid is called chyme PROTEIN POLYPEPTIDES Protease
DUODENUM • Pancreatic amylase digests starch into maltose • Protease digests polypeptides into dipeptides • Lipase digests fat into fatty acid and glycerol STARCH MALTOSE POLYPEPTIDES DIPEPTIDES Pancreatic amylase Protease FAT Lipase FATTY ACID AND GLYCEROL LIVER : GALL BLADDER: PANCREAS: • To produce bile • To store bile • To produce pancreatic juice which contain lipase, amylase, protease. (L,A,P) BILE: • To emulsify fat ALL THIS THING WORKS IN DUODENUM !!!! SMALL INTESTINE • Secrete enzyme maltase and protease • Maltase digests maltose into glucose • Protease digests dipeptides into amino acid MALTOSE GLUCOSE Maltase DIPEPTIDES AMINO ACID Protease
LARGE INTESTINE RECTUM ANUS • Undigested food will enter large intestine. • The process of water reabsorption happen • Store undigested food before eliminated • Faeces are eliminated from the body through anus
LAMP FORMULA Fat L A M P Carbohydrate Protein = FAT FATTY ACID + GLYCEROL STARCH MALTOSE MALTOSE GLUCOSE PROTEIN POLYPEPTIDES POLYPEPTIDES DIPEPTIDES DIPEPTIDES AMINO ACID L= Lipase A= Amylase M= Maltase P= Protease = particles that can be absorbed by body (a) (b) (c) THIS IS THE BEST PART !!!
L PANCREAS duodenum A Salivary Amylase Pancreatic Amylase SALIVARY GLAND PANCREAS mouth duodenum M SMALL INTESTINE small intestine P STOMACH PANCREAS SMALL INTESTINE stomach duodenum small intestine = Produce by = Occur in
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